Usually, it doesn’t come up. I think I project an air of “not really interested” so it doesn’t even reach the point where they’d even try. Besides, most of the women who know are already in a relationship and wouldn’t be in a position to take on a “challenge”.

The one exception I can think of was asexual herself, so it was less of a “Challenge Accepted” and more of a “Wow! Another one! Capture him!”